CAJ | 학술논문

采用样地调查法对南京方山国家地质公园朴树群落特征进行研究.结果表明:(1)群落中朴树的优势地位突出,其重要值为44.481%,是该群落的第1优势种;主要伴生树种有构树、茅栗、榉树、麻栎、榔榆、刺槐等;群落成层现象明显,可分为乔木层、灌木层(含下木层)和草本层,但地被层不发达;(2)群落垂直结构较为简单,乔木层共有木本植物15种.乔木层丰富度指数(S)、Shannon‐Wiener 指数( H′)、Simpson 指数(D)、种间相遇机率(PIE)、Pielou 均匀度指数( J)分别为7.429、1.406、0.696、0.054、0.723,物种多样性总体偏低;(3)朴树种群年龄结构表现为Ⅰ、Ⅱ级幼苗普遍较少,幼苗贮备严重不足,种群自身更新不良,整体处于衰退之中;(4)采用扩散系数(C)、负二项参数(K )、扩散型指数(Iδ)、Cassie 指标(Ca )、丛生指标(I)、平均拥挤度指数(m 倡)和聚块性指标(m 倡/m)进行分析,朴树种群的空间分布格局均为集群分布,但不同样地中的种群集聚程度因生境的变化而存在一定差异.
채용양지조사법대남경방산국가지질공완박수군락특정진행연구.결과표명:(1)군락중박수적우세지위돌출,기중요치위44.481%,시해군락적제1우세충;주요반생수충유구수、모률、거수、마력、랑유、자괴등;군락성층현상명현,가분위교목층、관목층(함하목층)화초본층,단지피층불발체;(2)군락수직결구교위간단,교목층공유목본식물15충.교목층봉부도지수(S)、Shannon‐Wiener 지수( H′)、Simpson 지수(D)、충간상우궤솔(PIE)、Pielou 균균도지수( J)분별위7.429、1.406、0.696、0.054、0.723,물충다양성총체편저;(3)박수충군년령결구표현위Ⅰ、Ⅱ급유묘보편교소,유묘저비엄중불족,충군자신경신불량,정체처우쇠퇴지중;(4)채용확산계수(C)、부이항삼수(K )、확산형지수(Iδ)、Cassie 지표(Ca )、총생지표(I)、평균옹제도지수(m 창)화취괴성지표(m 창/m)진행분석,박수충군적공간분포격국균위집군분포,단불동양지중적충군집취정도인생경적변화이존재일정차이.
@@@@The community character of Celtis sinensis of Fangshan National Geological Park in Nanjing was studied using quadrat survey .The results were as followed :(1)the dominant species of the community was C .sinensis ,of which the important value was 44 .481% ,and there were Broussonetia papyrifera ,Castanea seguinii ,Zelkova serrata ,Quercus acutissima ,Ulmus parvi folia and Robinia pseudoacacia in upper layer as main companion tree species ;(2)the popula‐tion structure was simple and there were 15 arborous species at upper layer ,and the species diversity indexes of the tree layer were a bit low by analyzed five indices ,species richness(S) ,Shannon‐Wiener index (H′) ,Simpson index (D) ,PIE index ,Pielou evenness index (J) ,and these indexes were 7 .429 ,1 .406 ,0 .696 ,0 .054 ,0 .723 by calculation ;(3)the diame‐ter class structure of C .sinensis population showed the seedlings numbers of class Ⅰ and Ⅱ were less ,so that the young seedlings reservoir was not seriously enough .The ability of self‐renewing of the population was bad ,so they tended to atrophy quantitatively and were in the decline ;(4)the spatial pattern of seven sampling plots were aggregative distribu‐tion through testing cluster‐intensity coefficient for instance K‐value of negative binomial ,dispersal index (C) ,index of dispersion pattern(Iδ) ,Cassie index(Ca) ,clumping index (I) ,index of mean crowding (m* )and index of patchiness(m* /m) ,but there were certain difference among seven sampling quadrats in their aggregative degree .